4.7 Article

On temperature and strain-rate dependence of flow serration in HfNbTaTiZr high-entropy alloy

期刊

SCRIPTA MATERIALIA
卷 200, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113919

关键词

High-entropy alloys; Serrated flow; Portevin-Le Chatelier effect; Dynamic strain aging; Theoretical modeling

资金

  1. National Natural Science Foundation of China [51901077, 52001271]
  2. Taishan Scholars Youth Expert Program
  3. National Science Foundation [DMR-1611180, 1809640]
  4. US Army Research Office [W911NF-13-1-0438, W911NF-19-2-0049]
  5. High Entropy Materials Center from The Featured Areas Research Center Program within the of the Higher Education Sprout Project by the Ministry of Education (MOE)
  6. Ministry of Science and Technology (MOST) in Taiwan [MOST 109-2634-F-007-024]
  7. DOE Office of Science [DE-AC02-06CH11357]

向作者/读者索取更多资源

The study investigates the flow serration in the HfNbTaTiZr alloy at different temperatures and strain rates, successfully modeling the transition of the onset strain behavior with a theoretical framework. The model's success in predicting the onset strain as a function of temperature and strain rate represents the possibility of constructing a process window for the alloy theoretically.
Plastic instability manifested as the serrated flow on stress-strain curves of metal alloys is generally detrimental to their processing and manufacturing. The flow serration in the HfNbTaTiZr alloy is reported in the present work and its dependence on temperatures (573-823K) and strain rates (5 x 10(-5) s(-1)-1 x 10(-3) s(-1)) is investigated with experiments. The notable transition of the onset strain of the serrated flow from a declining (normal behavior) to rising (inverse behavior) trend with increasing temperature at applied strain rates is modeled successfully with a theoretical framework. The success of the model in predicting the onset strain as a function of temperature and strain rate represents a possibility of theoretically constructing a process window for the alloy under examination and beyond. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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